SITE INFORMATION AND CORRESPONDENCE

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California Concentrates -2 - 28 September 2017 San Joaquin County foam (Figure 2). The cause/source of the foam was unknown. The pH was reported to be above 6.5 (within the WDR limit). Wastewater Pond No. 3, the eastern most pond, had approximately 1 foot of water in the bottom (Figure 3). A layer of solids was observed floating along the eastern edge of the pond surface (Figure 4). No aerator was present in the pond. Dominic informed me that once there is sufficient wastewater in the pond to float an aerator, one of the aerators from Pond No. 2 will be placed into Pond No. 3. Diatomaceous earth and cherry residuals were stockpiled adjacent to Pond No. 3 (Figure 5). The material appeared to be fresh and is reportedly hauled off-site for disposal. No significant odors were detected near the stockpiled material. We then proceeded to the evaporation/percolation beds located south of the wastewater ponds. Minimal water was observed in the beds (Figure 6). Dominic informed me that during the 2016/2017 winter the eastern berm surrounding the beds was breeched when the Mokelumne River flooded the adjacent property/vineyard. The eastern berm of the evaporation beds was subsequently repaired by placing fill to restore the berm (Figure 7). The fill appeared to contain a substantial amount of gravel. No signs of overflow or erosional damage were observed along the remaining berms surrounding the evaporation beds. To conclude the inspection we proceeded to the processing facility to see where the grapes are destemmed and pressed. Grape residuals were being loaded directly into trucks and hauled off site for disposal. From there we proceeded into the process facility to verify the pH meter and automated wastewater neutralization system was operational. The system was operating and the wastewater pH was above 7.0. CONCLUSIONS/RECOMMENDATIONS: Odors associated with wastewater were detected periodically in the vicinity of the wastewater ponds. The low pH reported in Pond No.1 is a violation of the WDRs and must be corrected. If not removed, the solids floating on the water surface of Pond No. 3 may generate nuisance conditions (odors, fly/mosquito breeding) and cause a violation of the VVDRs Therefore the solids should beremoved. The WDRs do not describe the Discharger's current practice of solids being stockpiled near Pond No. 3. Since the stockpiled material may generate odors as the organic material decomposes, the material should be hauled off-site for disposal in a timely manner. The Discharger should prepare and submit a Solids Management Plan for submittal to the Board. The Discharger should have the repaired berm for the percolation beds evaluated by a California Licensed Professional Engineer to ensure the berm was repaired with appropriate materials and compacted sufficiently to maintain the stability of the berm. Brendan Kennyf-Engineering Geologist